21323312331 has 16 divisors (see below), whose sum is σ = 29179670400. Its totient is φ = 13846016448.

The previous prime is 21323312303. The next prime is 21323312333. The reversal of 21323312331 is 13321332312.

It is not a de Polignac number, because 21323312331 - 2¹³ = 21323304139 is a prime.

It is a super-2 number, since 2×21323312331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21323312333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 578101 + ... + 613878.

It is an arithmetic number, because the mean of its divisors is an integer number (1823729400).

Almost surely, 2^21323312331 is an apocalyptic number.

21323312331 is a deficient number, since it is larger than the sum of its proper divisors (7856358069).

21323312331 is a wasteful number, since it uses less digits than its factorization.

21323312331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192138.

The product of its digits is 1944, while the sum is 24.

Adding to 21323312331 its reverse (13321332312), we get a palindrome (34644644643).

The spelling of 21323312331 in words is "twenty-one billion, three hundred twenty-three million, three hundred twelve thousand, three hundred thirty-one".